MissionGameplay has a function IsControlDisabled() which returns m_ControlDisabled. m_ControlDisabled is being set whenever you enable/disable controls. It is being set to false as soon as its set to true on line
~587 of MissionGameplay within the OnUpdate function.

if( playerPB )
{
    if( !menu && m_ControlDisabled && !playerPB.GetCommand_Melee2() )
    {
        PlayerControlEnable(true);
    }
}